Temperature Barometer Reading
Correction Calculator
This calculator requires the use of Javascript enabled and capable browsers. This script determines the error in an observed barometer reading, based on temperature (only) expansion and contraction differences. The metal housing of the barometer and the mercury both expand as the temperature increases. However, they expand at different rates. The barometer is calibrated for 0 degrees C (32 degrees F). For different temperatures a correction must be applied to compensate for the different expansions of the housing and the mercury. For temperatures greater than 0 degrees C, the correction should be added to the observed height; for temperatures less than 0 degrees C, the very minor correction should be subtracted. Contraction differences are extremely small and almost negligible. The default values are typical for the general lower desert area of Southern California. To use the calculator, enter the temperature and the known and observed barometer reading, in any of the designated values, then click on Calculate. Results are returned in both inches of mercury and millibars. There is also a temperature correction chart below the calculator.
The standard value for atmospheric pressure at sea level (ATM) is equal to:
1 atm = 29.92 in Hg (inches of mercury)
1 atm = 760 mm Hg (millimeters of mercury)
1 atm = 1013.20 millibars
1 atm = 14.7 psi (pounds force per square inch)
1 atm = 1013.20 hPa (hectopascals)
To further complicate matters, there are actually 2 values for an atmosphere. The first is generally called "standard" and the other is termed as "scientific". These are based on standard atmosphere calculations. Other pressure correction calculators are for altitude correction only, for gravity (latitude) correction only, for temperature and altitude correction and for gravity, altitude, and temperature correction.
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